Ali, Hazrat, and Md Shafiqul Islam. “Generalized Galerkin Finite Element Formulation for the Numerical Solutions Of Second Order Nonlinear Boundary Value Problems”. GANIT: Journal of Bangladesh Mathematical Society 37 (February 20, 2018): 147-159. Accessed July 18, 2019. https://www.banglajol.info/index.php/GANIT/article/view/35733.